1. School of Electronic Science and Engineering and Clean Energy Materials and Equipment Center, University of Electronic Science and Technology of China, Chengdu 611731, China
2. Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
3. Key Laboratory of Precision Measurement Technology and Instrument, Department of Precision Instrument, Tsinghua University, Beijing 100084, China